Long before India became known for its space missions and particle physics research, B. V. Sreekantan was venturing deep underground in the Kolar Gold Fields, searching for some of the universe's most elusive particles. His work helped place India at the forefront of cosmic ray and neutrino research, while his leadership shaped many of the scientific institutions that continue to drive Indian astronomy and physics today. 

Early Life and Education

Badanaval Venkatasubba Sreekantan was born on 30 June 1925 in Nanjangud, near Mysuru, into a traditional scholarly family. His father, an Ayurvedic physician and founder of the well-known Nanjangud Ayurvedic Dental Powder, maintained a large home library that nurtured Sreekantan's lifelong love of reading. Weekly discussions on the Bhagavad Gita and philosophy at home also sparked an enduring interest in the relationship between science and philosophy.

He studied physics at the University of Mysore, graduating with honours in 1946 before completing a master's degree in wireless communication in 1947. Although he initially hoped to pursue theoretical physics, a year at the Indian Institute of Science (IISc) introduced him to electronics, a skill that would later prove invaluable. Inspired by lectures from Homi J. Bhabha and the Mexican physicist Manuel Vallarta, he developed a fascination for cosmic rays and, in 1948, accepted Bhabha's invitation to join the newly established Tata Institute of Fundamental Research (TIFR).

Building India's Cosmic Ray Research

At TIFR, Bhabha encouraged Sreekantan to pursue experimental rather than theoretical physics, believing his electronics background made him ideally suited to building scientific instruments. Working with discarded Second World War equipment and components sourced from Mumbai's Chor Bazaar, he helped design India's earliest particle detectors and Geiger counters.

His first major research focused on muons, particles produced when cosmic rays strike Earth's atmosphere. These experiments eventually took him deep underground into the Kolar Gold Fields (KGF) in Karnataka, where he measured cosmic radiation at unprecedented depths. Although the original experiments did not detect the particles he expected, they laid the foundation for one of India's greatest contributions to particle physics.

In the mid-1960s, Sreekantan and an international team working at KGF achieved the world's first detection of atmospheric neutrinos deep underground, years before such experiments became common elsewhere. This pioneering work established India as a leader in underground particle physics and demonstrated that neutrinos could be studied using mines as natural laboratories.

Exploring the High-Energy Universe

Following research visits to the Massachusetts Institute of Technology (MIT) and laboratories across Europe and the United States, Sreekantan introduced several new experimental techniques to India. He helped develop scintillation counters, built one of the world's largest multi-plate cloud chambers at Ooty, and led extensive studies of cosmic ray air showers, revealing new insights into high-energy particle interactions.

He later established India's programme in X-ray astronomy, developing balloon-borne experiments that studied cosmic X-ray sources high above Earth's atmosphere. Instruments developed by his team eventually formed part of AstroSat, India's first dedicated multiwavelength space observatory launched in 2015.

Across a career spanning more than six decades, Sreekantan published over 300 scientific papers, supervised generations of researchers, and authored several influential books on physics, astrophysics and the relationship between science, biology and consciousness.

Leadership and Institution Building

Sreekantan spent 39 years at TIFR, serving as its Director from 1975 to 1987. During his tenure he transformed the institute's research landscape by expanding programmes in astrophysics, particle physics and instrumentation.

He played a key role in establishing several institutions that continue to shape Indian science, including the National Centre for Biological Sciences (NCBS) in Bengaluru, the National Centre for Radio Astrophysics (NCRA) in Pune, the Homi Bhabha Centre for Science Education (HBCSE) in Mumbai and the TIFR Centre for Applicable Mathematics in Bengaluru. He also supported the expansion of the TIFR Balloon Facility in Hyderabad and encouraged the proposal that eventually led to the creation of the Giant Metrewave Radio Telescope (GMRT).

After decades in Mumbai at TIFR, Sreekantan eventually settled in Malleswaram, Bengaluru. He joined the National Institute of Advanced Studies (NIAS) in Bengaluru as the Dr. S. Radhakrishnan Visiting Professor, where his research increasingly explored the intersection of physics, biology and consciousness.

The Man Behind the Scientist

Despite becoming one of India's foremost experimental physicists, Sreekantan often admitted that his first love had been theoretical physics. In later interviews, he recalled telling Homi Bhabha that he would accept whatever research direction Bhabha considered best. That decision led him into experimental physics—a path that ultimately defined his career.

He also fondly remembered the ingenuity required during India's early scientific years. With limited resources, his team built sophisticated detectors using surplus military equipment and locally sourced components, demonstrating that determination and creativity could overcome technological constraints.

Throughout his life, Sreekantan remained deeply interested in philosophy and the nature of consciousness, reflecting the influence of the spiritual discussions he had listened to as a child in Nanjangud.

Recognition and Honours

Sreekantan received numerous honours for his pioneering contributions to astrophysics and particle physics. He was elected Fellow of all three of India's national science academies—the Indian Academy of Sciences, Indian National Science Academy, and National Academy of Sciences, India—as well as the Maharashtra Academy of Sciences. He was also an honorary fellow of both TIFR and the Indian Institute of Astrophysics.

His major awards included the Homi Bhabha Medal (1978), the R. D. Birla Memorial Award (1982), the C. V. Raman Award (1977), the Ramanujan Award of the Indian Science Congress (1989), the Jawaharlal Nehru Award (1991), the Rajyotsava Prashasti (1998), and the Sir M. Visvesvaraya Senior Scientist State Award (2004). In 1988, he was awarded the Padma Bhushan, India's third-highest civilian honour, in recognition of his outstanding contributions to science.

Legacy

B. V. Sreekantan played a pivotal role in establishing India as a leader in cosmic ray physics, underground neutrino research and X-ray astronomy. Beyond his own discoveries, he helped build major scientific institutions, launched lasting research programmes, and mentored generations of scientists, leaving a lasting impact on Indian astrophysics. 

Sources and References

https://en.wikipedia.org/wiki/B._V._Sreekantan

Wikipedia

Ramachandran, R. (2015). In Conversation with B. V. Sreekantan: Cosmic Ray Physicist and Astronomer. Frontline, 21 August 2015. Available at: NIAS Repository